<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
	<head>
		<title>XHTML 1.1 example</title>
	</head>
	<body>
		<h1>XHTML 1.1 example</h1>
		
		<p>This is an example for the datatype change of the @class attribute in XHTML 1.1 (EPUB 2).</p>
		<p>After the <a href="https://www.w3.org/TR/xhtml-modularization/Overview.html#status"
			>latest revision of the XHTML 1.1 DTD in 2010</a> the @class attribute
			allows for empty values.</p>
		<p>At the time of this writing, oXygen will report this as invalid because
			they also use an outdated version of the XHTML 1.1 DTD for validation.
			However, this will be fixed in a future release.</p>
		
		
		<div class="">
			Empty @class attribute is valid
		</div>
	</body>
</html>